Scotch Ales are strong ales, also known as "Wee Heavy." In the 19th century Scotland, they'd also be known as 160/-, a nomenclature based on the now obsolete shilling currency.
Scotch Ales traditionally go through a long boil in the kettle for a caramelization of the wort. This produces a deep copper to brown in colored brew. Compared to Scottish Ales, they'll be sweeter and fuller-bodied, and of course higher in alcohol, with a much more pronounced malty caramel and roasted malt flavor. A low tea-like bitterness can be found in many examples. Best served in a "thistle" glass.
Average alcohol by volume (abv) range: 6.0-10.00% --BeerAdvocate